Pitman



(No Model.)

' J. MOSSMAN.

PITMAN. No. 362,032. Patented Apr. 26, 1887.

UNITED STATES PATENT OFFICE.

JAMES MOSSMAN, OF "WESTERVILLE, OHIO.

PITMAN.

SPECIFICATION forming part of Letters Patent No. 362,032, dated April 26, 1887.

Application filed February 18, 1887, Serial No. 228,063. (No model.)

.To all whom, it may concern.-

Be it known that I, JAMES MossMAN, a citizen of the United States, residing at WVesterville, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Pitmen; and I do declare the following to be a full, clear, and exact description of theinvention, such aswill enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon,which form a part of this specification.

This invention relates to self-lubricating pitmen; and it consists in the novel features presently to be described and claimed, and

shown in the drawings, in which- Figure 1 is a view in elavation; Fig. 2, a

cross-section on the line X X of Fig. 1, on an enlarged scale. Fig. 3 is a detail view of the upper end of the pitman. Fig. 4 is a modified form, and Fig. 5 is a detail view of one end of the modified form. The object of the invention is the construction of a pitman which will be simple, compact, and economical in cost, and which will direct the excess of lubricant from the upper bearing by a direct passage onto the lower bearing, thus producing a saving of the lubricant.

The pitman is composed of cast metal and has openings at each end forming the upper and lower bearings, a and a, respectively. The upper bearing is partially surrounded by the oil-chamber A, which extends about an equal distance on each side of a line passing vertically through the top of the chamber and below the center of the opening or bearing a, from the top of which the passage 1) leads into the chamber A. Lubricant is filled into the chamber A through the opening 0, and normally rests below the opening b, over which a suitable wick or fabric is placed, having its ends extending to the bottom of the chamber on each side for feeding the oil by capillary attraction to the bearing through the opening I), as will be readily comprehended. By having the chamber A nearly surrounding the bearing the latter is kept cool, and in winter time the slight heat occasioned by the friction between the wrist-pin and bearing will readily warm and keep the lubricant in a fluid state. The solid portion (1, between the bearing and the body 13 of the pitman, forms a firm connection between the pitman-headB and body B, which latter is reduced in width and thickness between the two bearings a and a. The rib D, projecting from one side of the pitman and extending about flush with the sides of the pitman heads, is channeled the entire length. The lower end of the channel 6 extends into the bearing a and the upper end is separated or divided, forming the two branches e e, which extend upon each side of the bearing a and catch the surplus lubricant, and direct it into the channel e, by which it is guided onto the lower bearing and lubricates the same.

It will be noticed that the pitman with the chamber and channel is made at a single casting and in one piece.

The pitmau shown in Figs. 1, 2, and 3 is adapted to be used in substantially a vertical position.

Figs. 4 and 5 show a modified form of pitman designed to be used in substantially a horizontal position. Each end thereof is provided with a chamber, A, and openings 1) and 0', similar to those shown in Fig. 3.

The channel or groove 6 has no direct con-- nection with the oil-chamber A, and is formed in the side of the pitman only. In practice it is found that excess of lubricant will escape from the upper bearing at one end, preferably that end adjacent to the moving or working part, and will trickle down the pitman in a wave-like or sinuous course and be wasted. The branches of the channel will catch this excess of lubricant and give it a positive and certain course and direct it to the lower bearing by way of the channel, where it will subserve a useful purpose and not be spent to no purpose.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

The herein shown and described pitman having a bearing at each end and an oil-chamber at its upper end, and having a channel extending along one side thereof, the lower ICC - stantially as set forth.

In testimony whereof I afiiX my signature in presence of two witnesses.

JAMES MOSSMAN.

Vitnesses:

VAN BUREN HILLYARD, NORRIS A. CLARK. 

